WHILE IDLING SMALL AMOUNT OF VIBRATION COM

Dear Sir,
i have purchaed my car in year 2010 and at present it has completed 600 kms. Earlier I have not given attention but now a days I am founding that my car has litter vibration and cabin sound during idling. My RPM is showing 800 to 900. Whther this much sound is ok or I have to take this to the service center.